Fixed multiple pub sub causing crash due to new replication attestations

[imnik11]

Description

we were using same pub sub for replication attestation during transaction validation which caused crash due to beacon explorer was also using the same. Now we added a separate PubSub for beacon explorer to get the transaction attestations and push it to UI

Fixes #429

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

Run 3 nodes and checked the logs, Now I don't get a lot of logger msg showing same info. And the transaction duplication is also fixed in beacon explorer

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

[Neylix]

Nice catch !